(Phys.org) —New tests using carbon dating techniques on materials found at a site approximately a mile from Stonehenge suggest that the area was continuously occupied thousands of years earlier than scientists have believed.

But every now and then, scientists' persistence pays off. A recently discovered clutch of 150-million-year-old fossil eggs is being billed as an important missing link in the evolution of dinosaur eggs.

The find from the Late Jurassic period, described in a paper published May 30 in the journal Scientific Reports, gives scientists a picture of early dinosaur eggs and embryos from a group called theropods, which include Tyrannosaurus rex and modern birds.

Scientists have named a new species of bone-headed dinosaur (pachycephalosaur) from Alberta, Canada. Acrotholus audeti (Ack-RHO-tho-LUS) was identified from both recently discovered and historically collected fossils.

Rock paintings dating back thousands of years ago have been found in the Turkish province of Aydın’s Çine district.

The rock paintings, which are believed to be 7,500 years old, are from the end of the Neolithic Age and the beginning of Chalcolithic Age in 5500 BC [Credit: Hurriyet]

Similar rock paintings have previously been found in the Beşparmak Mountains, Bafa Lake and its environs, all of which are located in an area divided between Muğla’s Milas district and Aydın’s Koçarlı and Söke districts.

The paintings, which are believed to be 7,500 years old, were discovered as part of work conducted by Tekirdağ Namık Kemal University Archaeology Department Professor Neşe Atik initiated in 2000.

When people say that scientists are always changing their minds, it’s usually meant as a slight. How can anyone trust conclusions that are so prone to revision? But the fluctuating nature of science is a feature not a bug. It means that our knowledge of the world is constantly being updated in the face of new evidence.

The search for ever deeper relationships among the World’s languages is bedeviled by the fact that most words evolve too rapidly to preserve evidence of their ancestry beyond 5,000 to 9,000 y. On the other hand, quantitative modeling indicates that some “ultraconserved” words exist that might be used to find evidence for deep linguistic relationships beyond that time barrier. Here we use a statistical model, which takes into account the frequency with which words are used in common everyday speech, to predict the existence of a set of such highly conserved words among seven language families of Eurasia postulated to form a linguistic superfamily that evolved from a common ancestor around 15,000 y ago. We derive a dated phylogenetic tree of this proposed superfamily with a time-depth of ∼14,450 y, implying that some frequently used words have been retained in related forms since the end of the last ice age. Words used more than once per 1,000 in everyday speech were 7- to 10-times more likely to show deep ancestry on this tree. Our results suggest a remarkable fidelity in the transmission of some words and give theoretical justification to the search for features of language that might be preserved across wide spans of time and geography.

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